Multi-Layer Interlayer Film for Wideband Sound Insulation
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Solution Overview
Problem
Conventional laminated glasses with existing interlayer films exhibit enhanced sound insulating properties only in specific resonance frequency regions, failing to provide effective sound insulation across a wide frequency range (500 Hz to 10000 Hz).
Innovation Solution
An interlayer film with a one-layer or multi-layer structure, comprising layers with specific resin compositions and plasticizers, is used between two sheets of clear float glass, achieving loss factors of 0.4 or more at multiple resonance frequencies to enhance sound insulation and vibration damping across a broad frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional interlayer films are used to enhance sound insulating property in a specific resonance frequency region, then sound insulation is improved at that frequency, but sound insulating property deteriorates in other resonance frequency regions
Solution Approach 1:
The interlayer film is divided into multiple layers with different resin compositions and properties. Each layer is designed to address specific frequency ranges, with the first layer containing a first resin and the second layer containing a second resin that differs from the first. This segmentation allows different parts of the film to perform different functions across the frequency spectrum, resolving the contradiction between improving sound insulation at specific frequencies while maintaining performance across all frequencies.
Solution Approach 2:
The invention uses composite interlayer films combining multiple resin types with complementary properties. The first resin and second resin are selected to provide different damping characteristics, creating a composite material that can effectively attenuate sound across a broad frequency range. This composite approach allows the film to achieve high sound insulation performance both at specific resonance frequencies and across the overall 500-10000 Hz range.
2Loss of energy
If interlayer film with high loss factor is used to improve vibration damping, then vibration insulation is enhanced, but adhesive strength may be compromised
Solution Approach 1:
The interlayer film is segmented into multiple layers where each layer serves a specific function. The first layer provides high loss factor for vibration damping, while the second layer ensures adequate adhesive strength. By segmenting the film this way, the invention resolves the contradiction between achieving high vibration damping and maintaining adhesive strength, as each layer is optimized for its specific function without compromising the other.
Solution Approach 2:
Different regions of the interlayer film have different properties tailored to their specific functions. The first layer is designed with properties optimized for vibration damping (high loss factor), while the second layer has properties optimized for adhesion. This local quality differentiation allows the film to simultaneously achieve both vibration damping and adhesive strength without compromise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The interlayer film significantly improves sound insulating properties and vibration damping in laminated glass, exceeding the mass law's sound insulation performance, particularly in the 500 Hz to 10000 Hz range, with enhanced adhesive strength and impact resistance.
Implementation Method 1
a loss factor at a second resonance frequency, a loss factor at a third resonance frequency, and a loss factor at a fourth resonance frequency measured by a central exciting method at 20° C. in mechanical impedance measurement in accordance with ISO16940 of the laminated glass X are respectively 0.4 or more
Implementation Method 2
enhance the sound insulating property of laminated glass over a wide resonance frequency region
Data Source
AI summary
Provided is an interlayer film for laminated glass capable of enhancing the sound insulating property of laminated glass over a wide resonance frequency region. An interlayer film for laminated glass according to the present invention has a one-layer or two or more-layer structure, and when the interlayer film is arranged between two sheets of clear float glass having a width of 25 mm, a length of 300 mm and a thickness of 2 mm to obtain a laminated glass X, a loss factor at a second resonance frequency, a loss factor at a third resonance frequency, and a loss factor at a fourth resonance frequency measured by a central exciting method at 20° C. in mechanical impedance measurement in accordance with ISO16940 of the laminated glass X are respectively 0.4 or more.